Simulation apparatus for motor-driven compressor system and the simulation method thereof

Abstract

With a simulation apparatus for a system including a motor-driven compressor, a compressor that does not suffer from a driving torque shortage and surging, but can operate at low costs, can be provided.A simulation apparatus for a motor-driven compressor system includes a simulation section in which a driving motor, a compressor driven by the driving motor, a suction throttle valve controlling the inlet flow rate of the compressor, and an anti-surge valve interposed between pipes for returning a part of gas discharged from the compressor to the inlet side of the compressor are translated into unit models and stored. The simulation apparatus further includes an input section through which designed specification data of the compressor is input, a data setting section storing the designed specification data, and a display section displaying unsteady-state Q-H characteristics and required driving torque obtained through simulation by the simulation section.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]The present invention relates to a simulation apparatus for a system including a motor-driven compressor and a simulation method, and more particularly to a simulation apparatus and a simulation method suitable for evaluating the feasibility of starting the motor-driven compressor system.[0003](2) Description of the Related Art[0004]For turbo compressor systems handling process gas in petrochemical fields, motor-driven turbo compressors are often selected to downsize the system and to provide expandability and for other reasons. When a new facility is introduced to a plant, or operating conditions of the plant are changed, the system with a motor-driven turbo compressor boots up the compressor until the compressor operates at its rating, which is so called a “startup” operation executed to ensure safe inauguration of the plant. In a plant design phase prior to the actual check operation, every component of the compress...

AI Technical Summary

Benefits of technology

The invention provides a solution for a motor-driven compressor system that can startup without experiencing torque shortage and surging. The solution is a simulation apparatus that can imitate the unsteady state of the compressor system during startup. This results in an economical compressor system that can operate without these issues.

Problems solved by technology

However, seasonal variations, types of gas to be handled and other factors greatly change the operational conditions of the process compressor systems.

If the compressor systems need to operate under conditions different from those used for the optimal design, the compressor system cannot always perform optimal operations.

Especially, a compressor starting at a high pressure requires more driving torque, and therefore over-torque occurs in the motor with a torque capacity chosen under normal operating conditions, which may hinder the compressor from starting up.

However, as described above, when the process conditions at startup are different from specifications designed for general operations, the compressor systems cannot be operated in an optimal operational manner as if it is controlled by sophisticated techniques actually used by operators with practical experiences, for example, pressure control using the suction throttle valve and other valves and flow rate control using the anti-surge valve, to avoid surging.

Images